package chpt01;

public class HelloWorld { // HelloWorld为public类的类名，需与文件名相同
    public static void main(String[] args) {
        System.out.print("This is my first");  // 输出, 无换行
        System.out.println(" Java program. "); // 输出，换行
        System.out.println("Hello World!");
    }
}

//  System.out.printf("%20s%n", "*****");
